XTPTFABS Trailer Hub Dust Caps with O-Ring 4-Pack — Threaded 2 5/16" for 5-Bolt Dexter Vortex Hubs

XTPTFABS 81143 hub dust caps are threaded replacement covers with an O-ring, sold as a 4-pack, made to fit 5-bolt Dexter Vortex trailer hubs (48355V/K71-G01-73/21-261).

These threaded hub caps provide a straightforward way to replace worn or damaged dust covers on small- to mid-capacity Vortex trailer hubs. Constructed from a durable material and paired with a sealing O-ring, the caps restore protection to bearings and grease cavities while matching the 2 5/16" outer thread diameter common to many 1250–1750 lb Dexter Marine and Tie Down Engineering Vortex hub kits. This listing includes four identical caps, so you can service both wheels on one axle or keep spares on hand.

Will these caps fit my trailer hub?

These XTPTFABS caps are designed for Vortex-style hubs with five bolt holes and a threaded outer diameter of approximately 2 5/16". They are compatible with Dexter part numbers like 81143 and 48355V as well as other kits that use the same threaded cap interface.

• Fits: 5-bolt Vortex hubs (not for 6-lug hubs)
• Outer thread diameter: ~2 5/16 inches
• Compatible part numbers: 81143, 48355V, K71-G01-73, 21-261
• Sold as a set of 4 caps to service multiple wheels

How do I install the threaded dust cap and O-ring?

Installation is simple: clean the hub nose, seat the O-ring on the cap, then screw the cap into the hub threads until snug. The threaded design prevents accidental pop-off and the O-ring helps compress for a better seal against dirt and moisture.

• Remove old cap and clean hub nose and threads
• Place supplied O-ring onto the cap groove before threading
• Hand-thread until firm; use appropriate tool if necessary
• Verify a snug seal and that bearings spin freely afterward

What materials and durability can I expect?

These replacement caps are manufactured from a robust, wear-resistant material designed for road and marine environments. The parts resist typical corrosion and impact encountered during towing, but proper installation and periodic inspection will maximize service life.

• Durable construction suited for trailering and marine rigs
• Threaded body reduces risk of loss while towing
• O-ring improves sealing against water and dirt intrusion
• Pack of four offers spare coverage and value

Who is this for: This 4-pack is aimed at trailer owners, maintenance technicians, and fleet managers who use Dexter Vortex 1250–1750 lb hubs and need a reliable, threaded dust cap replacement with an O-ring. It's especially useful if you need matched replacements for both wheels on an axle or want spare caps for routine upkeep. If you're uncertain about compatibility, compare your hub's bolt pattern and outer thread diameter to the listed measurements or contact the seller for verification before purchasing.